Glimmerglass' Aida (July 7-August 25), Armide (July 14-August 23), and Lost in the Stars (July 22-August 25) (all in Cooperstown, NY)
No, not Gluck's Armide or even Rossini's, but the French baroque version by Lully. Not listed because it's not opera: a Music Man revival starring Dwayne Croft. Not listed because it would take too much space: recitals by Eric Owens, Deborah Voigt, and Dolora Zajick.